QUOTE(g88 @ Aug 3 2012, 11:22 AM)
Actually only 1" different, in fact 17" will give better FC as your car will move 'faster' = bigger diameter, lesser rotation
Fact is, total diameter (rim + tyre) + weight of rims matters.
17" rims and 16" rims at the end of the day, total diameter still the same thus number of rotations needed to reach 100km will be same hence FC will be same.
Then we look to rim size. Generally, bigger rims = more metal, less rubber = heavier. Smaller rims, less metal, more rubber = lighter.
If we were to get a 16" rim thats the same weight as a 17" rim, then FC would be the same.
Best is, get 16" lightweight rims for best FC